Page 383 - Math Smart - 7

@ Lastly, rotate point C We can use
vertical and horizontal P
construction lines to show a path
n
.
from point C to the origin. Look at
A
the orange construction lines.
C
0 Rotate the orange construction lines
90° clockwise about the origin. i
This gives the green construction ~ 2 - 1 0 A'
lines. Make sure the green lines
are as long as the orange lines. Label B'
o
the end of the longer green line C. Spotlight
(J) Join points A', B' and C with
Watch this video to see
straight lines to form AA'B'C.
how to use a protractor
AABC has been rotated 90° and a ruler to carry out
clockwise about the origin to rotations.
form the image AA'B'C.

The coordinates of AA'B'C are:
A' (2, 0)
iiSi
B' (3, -1)
C (3, 1)

Given A (1, 3), B (3, 7), C (6, 6) and D (3, 1), plot and draw quadrilateral ABCD on a
coordinate grid. Rotate quadrilateral ABCD 1 S0° anti-clockwise about the origin,
and then draw its image.
Solution
Use a protractor and a ruler to help you determine how many turns is an angle of
180° to rotate each point through the origin.
V

Spotlight

Watch this video to learn
how to describe rotation
given the object and the
image.

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Eli:®®